FLOOR, MROUND, CEILING, ISO CEILING – DAX Guide
FLOOR: Rounds a number down, toward zero, to the nearest multiple of significance.
https://dax.guide/floor/
MROUND: Returns a number rounded to the desired multiple.
https://dax.guide/mround/
CEILING: Rounds a number up, to the nearest integer or to the nearest unit of significance.
https://dax.guide/ceiling/
ISO.CEILING: Rounds a number up, to the nearest integer or to the nearest multiple of significance.
https://dax.guide/iso-ceiling/